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Journal Article

Agarum Kelp Beds as Nursery Habitat of Spot Prawns, Pandalus platyceros Brandt, 1851 (Decapoda, Caridea)

Jeffrey B. Marliave and Myron Roth
Crustaceana
Vol. 68, No. 1 (Jan., 1995), pp. 27-37
Published by: Brill
Stable URL: http://www.jstor.org/stable/20105012
Page Count: 11

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Topics: Shrimp, Juveniles, Juvenile stages, Habitats, Summer, Yearlings, Straits, Overwintering, Censuses, Census data
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Agarum Kelp Beds as Nursery Habitat of Spot Prawns, Pandalus platyceros Brandt, 1851 (Decapoda, Caridea)
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Abstract

The spot prawn, Pandalus platyceros Brandt, 1851, predominantly uses kelp beds of Agarum sp. as nursery habitat in waters of southern British Columbia. Census data indicate interannual fluctuations in numbers of shrimp settling into nurseries. Analysis of size samples indicates settlement primarily in May and June, with lesser rates of settlement through the summer. Growth of about 3 mm CL per month can occur through summer and fall, with juveniles apparently emigrating from nurseries, starting in the fall, at sizes of 16-20 mm CL. Juveniles which fail to reach such size before winter remain in the nursery habitat, with slower overall growth at about 1 mm CL per month. This difference in duration of residence in kelp bed nursery habitat, together with different juvenile growth rates, leads to the conclusion that the age of spot prawns at a given size will be variable. Due to this variable early life history and growth, length frequency modes of spot prawns could include a mixed age group. /// Die Tupfengarnele, Pandalus platyceros Brandt, 1851, verbringt ihre erste Lebenszeit vorwiegend in den Kelpfeldern (Agarum sp.) vor Britisch-Kolumbiens Südküste. Bestandserhebungen zeigen, daß die Zahl der Garnelen, die in den Kelpfeldern eintreffen, im Laufe des Jahres schwankt. Größenanalysen lassen erkenen, daß der Hauptzuzug in den monaten Mai und Juni erfolgt mit geringeren Zuzugsraten während des Sommers. Im Sommer und Herbst kann die Carapaxlänge um 3 mm pro Monat zunehmen. Offenbar verlassen im Herbst jene Jungtiere ihre Kinderstube, die eine Carapaxlänge von 16-20 mm erreicht haben, während jene, die dies nicht geschafft haben, vor Ort überwintern. In dieser Zeit verlangsamt sich ihr Wachstum und ihre Carapaxlänge nimmt nur um 1 mm pro Monat zu. Diese Unterschiede in der Wachstumsgeschwindigkeit während des Aufenthaltes in der Kinderstube führen zu dem Schluß, daß Tupfengarnelen der gleichen Größe nicht gleichalt sein und folglich sich auch nicht gleich lange in den Kelpfeldern aufgehalten haben müssen.

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